Support go 1.18

[hferr]

Hey all!

When trying to install journey with go 1.18 on darwin/arm64 it fails as follows:

❯ go version
go version go1.18.3 darwin/arm64

❯ go install github.com/db-journey/journey/v2@latest
# golang.org/x/sys/unix
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:28:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:43:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:59:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:75:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:90:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:105:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:121:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:136:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:151:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:166:3: //go:linkname must refer to declared function or variable
../../go/pkg/mod/golang.org/x/[email protected]/unix/zsyscall_darwin_arm64.go:166:3: too many errors

As described in a similar issue here, I just bumped the version of golang.org/x/sys to fix this.

[gravis]

LGTM. Thanks for your contribution